Chemical Substances and Other Issues Under Study (TLV®-CS)

ACGIH® has a procedure that provides the public with an indication of where those chemical substances and physical agents under study fall in the development process. Tier 1 indicates which chemical substances and physical agents may move forward as an NIC or NIE in the upcoming year, based on their status in the development process. Tier 2 consists of those chemical substances and physical agents that will not move forward, but will either remain on or be removed from the Under Study list for the next year. For more information, please see the ACGIH® TLV®/BEI® Development Process


Tier 1 (may move forward with an NIC proposal in 2018) 

Chemical Substances

Acrylamide
Antimony hydride
Benzidine
Bifenazate (added 6-13-17)
Bromodichloromethane
Buprofezin (added 6-13-17)
n-Butyl acrylate (added 6-13-17)
n-Butyl isocyanate
Catechol
Chlorodiphenyl (42% Chlorine)
     (added 6-13-17)
Chlorodiphenyl (54% Chlorine)
     (added 6-13-17)
Cyclopentadiene
Cyromazine
3,3'-Dichlorobenzidine
1,1-Dichloro-1-nitroethane
Dicyclopentadiene
Di(2-ethylhexyl)phthalate
Difluorodibromomethane
Diiodomethyl p-tolyl sulfone
Dimethyl carbamoyl chloride
4,4-Dimethyloxazolidine
Dimethylphenol, isomers
Epichlorohydrin
Ethyl ether
Ethylene glycol dinitrate
Fluorine
Formamide
Furan
Germanium tetrahydride
Glyphosate (added 6-13-17)
Halothane
Hexamethylenetetramine (added 6-13-17)
Hexazinone
Imidacloprid
Indium and compounds (added 6-13-17)
Indium tin oxide
Iodine and Iodides
Isoflurane
Isopropylamine
Lindane
Methenamine (see
     Hexamethylenetetramine
)

Methyl isobutyl carbinol
Methyl vinyl ketone
Methylene bisphenyl isocyanate
Methyltetrahydrophthalic anhydride
    (added 6-13-17)

Metribuzin 
Monomethylformamide 
1-Naphthylamine 
2-Naphthylamine 
Nitric acid 
Nitroglycerin
Octachloronaphthalene
Parathion (added 6-13-17)
Perchloryl fluoride
Phenothiazine
Prometon
Prometryn
Propane sultone
Propylene glycol dinitrate (added 6-13-17)
Propylene glycol ethyl ether (added 6-13-17)
n-Propyl nitrate
Resin acids from Rosin-based solder
     flux (added 6-13-17)
Rosin core solder thermal decomposition 
     products (colophony) (see Resin acids
     from Rosin-based solder flux
)
Sodium sulfate
Styrene
Sulfoxaflor
Sulfur pentafluoride
Tetrachlorophthalic anhydride
1,2,3,6-Tetrahydro-3-methylphthalic
     anhydride (see Methyltetrahydro-
     phthalic anhydride
)
1,2,3,6-Tetrahydrophthalic anhydride
Tetramethyl succinonitrile
Thiacloprid
Thiodicarb (added 6-13-17)
Tin and inorganic compounds, excluding Tin hydride
Titanium dioxide
Titanium tetrachloride
Trichloronaphthalene
Triclopyr (added 6-13-17)
Triethanolamine
Trifloxystrobin (added 6-13-17)
Triflumizole (added 6-13-17)
Trimethyl phosphite
Vinyl acetate
Vinylidene chloride
Vinylidene fluoride

Chemical Substances as Vapor and Aerosol (V) – Review for Update to Inhalable Fraction and Vapor (IFV)

Phenyl ether, vapor

m-Xylene α,αʹ-diamine

Chemical Substances for Review of Inhalable Fraction and Vapor (IFV) Notation Update

Ammonium perfluorooctanoate
o-Anisidine
Chlordane
Chlorinated camphene
o-Chlorinated diphenyl oxide
o-Chlorobenzylidene malononitrile
Coumaphos
Dibutyl phenyl phosphate
o-Dichlorobenzene
p-Dichlorobenzene
Dichloroethyl ether
Dinitrobenzene
Dinitro-o-cresol
Dinitrotoluene
EPN
Ethanolamine
Ethyl silicate
Heptachlor
Hexachlorobenzene
Hexafluoroacetone
Isobutyl nitrite
Isophorone diisocyanate
N-Isopropylaniline

4,4'-Methylene bis(2-chloroaniline)
4,4'-Methylenedianiline
Nicotine
Nitrapyrin
5-Nitro-o-toluidine
Nitrotoluene, isomers
Pentachloronaphthalene
Pentachloronitrobenzene
m-Phenylenediamine
o-Phenylenediamine
p-Phenylenediamine
m-Phthalodinitrile
Sesone
Sulfometuron methyl
Sulprofos
Temephos
1,1,2,2-Tetrabromomethane
Tetrachloronaphthalene
Tributyl phosphate
1,2,4-Trichlorobenzene
2,4,6-Trinitrotoluene
Triphenyl phosphate

Other Issues Under Study

  1. Ototoxicant Notation (added 6-13-17)
  2. TLV®-Surface Limit (TLV®-SL) (added 6-13-17)

Tier 2 (will not move forward with an NIC proposal in 2018) 


Chemical Substances

Alkyl acrylates (added 6-13-17)
Aluminum sodium dioxide
Antimony and compounds
Benzene
1,3-Butadiene
4-tert-Butylbenzoic acid
Cobalt carbonyl
Cobalt hydrocarbonyl
Copper (added 6-13-17)
Cyclohexene
Diazinon (added 6-13-17)
1,3-Dichloro-5,5-dimethylhydantoin
Dicyclopentadienyl iron
Diesel exhaust
1,2-Dimethoxyethane
Ethyl acrylate
Ethylene oxide
Fluorides
Hafnium and compounds
Hexachloronaphthalene
sec-Hexyl acetate
Ketene (added 6-13-17)
Lead and inorganic compounds
Malathion (added 6-13-17)
Manganese cyclopentadienyl tricarbonyl

2-Methoxymethylethoxy propanol
Methyl acrylate
o-Methylcyclohexanone (added 6-13-17)
2-Methylcyclopentadienyl manganese
     tricarbonyl
Mica
Nickel and inorganic compounds, including
     Nickel subsulfide
Pentaborane
2,3-Pentanedione
Phosgene
Phosphoric acid (added 6-13-17)
Phosphorus (yellow) (added 6-13-17)
Quinone
Silicic acid
Sodium hypochlorite
Stoddard solvent
Sulfur trioxide
Tetrachlorvinphos (added 6-13-17)
Tetraethyl lead (added 6-13-17)
Tetramethyl lead (added 6-13-17)
Tin, organic compounds
Trimethylbenzene (mixed isomers)


Chemical Substances Removed from Under Study Effective 6-13-17

Methylcyclohexanone

 


Chemical Substances Removed from Under Study Chemical Substances as Vapor and Aerosol (V) – Review for Update to Inhalable Fraction and Vapor (IFV) section Effective 6-13-17

Phosphorous (yellow)

Tetraethyl lead


Chemical Substances Removed from Under Study Chemical Substances for Review of Inhalable Fraction and Vapor (IFV) Notation Update section Effective 6-13-17

Chlorodiphenyl (42% Chlorine)
Chlorodiphenyl (54% Chlorine)
Diethanolamine
Diquat-I
Diquat-R

Endosulfan
Methyl parathion
p-Nitroaniline
Phosphoric acid
Sulfuric acid